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      0SCK-0C6
      When a Problem Cannot Be Solved
      If you cannot solve a problem by referring to the information in this chapter, contact your local authorized Canon dealer or the Canon help line.
      Do not disassemble or repair the machine yourself
      If you disassemble or repair the machine yourself, it may not be covered by warranty.
      When Contacting Canon
      When contacting us, have the following information ready:
      Product name (MF729Cx / MF628Cw / MF621Cn)
      Dealer where you purchased the machine
      Details about your problem (such as what you did and what happened as a result)
      Serial number (eight alphanumeric characters long, found on the label on the back side of the machine)
      MF729Cx
       
      MF628Cw / MF621Cn
       
      Checking the serial number from  ()
      Press  (), and tap <Check Device Configuration>.
      Checking the serial number from the operation panel
      Press   Tap <Device Status>  <Serial Number>.